(Swift 3,4,5...) PKCS11 XML Signature using Certificate and Private Key on Smart Card / USB Token

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Sample code showing how to use PKCS11 to create an XML digital signature with a certificate and private key stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.96 or later.

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    let pkcs11 = CkoPkcs11()!

    // This example is tested on Windows using a Giesecke and Devrient Sm@rtCafe Expert 3.2 smart card.
    // You will use the DLL (or shared lib) provided by your smart card vendor, or a DLL compatible with your smart card.
    // On Windows, if the DLL is located in C:\Windows\System32, specify only the filename.
    // Otherwise provide the full path.
    pkcs11.sharedLibPath = "aetpkss1.dll"

    // Make it an authenticated session by calling Login.
    var userType: Int = 1
    // Make sure to use the correct PIN for your smart card..
    var pin: String? = "0000"

    var success: Bool = pkcs11.quickSession(userType, pin: pin)
    if success == false {
        print("\(pkcs11.lastErrorText!)")
        return
    }

    // Get the certificate (on the smart card) that has a private key.
    let cert = CkoCert()!
    success = pkcs11.findCert("privateKey", partValue: "", cert: cert)
    if success == true {
        print("Cert with private key: \(cert.subjectCN!)")
    }
    else {
        print("No certificates having a private key were found.")
        success = pkcs11.closeSession()
        return
    }

    // --------------------------------------------------------------------------
    // At this point, we have the cert to be used for signing.
    // Our XML signing code is the same as for a cert obtained from any other source..

    // First generate the following XML to be signed:
    // Use this online tool to generate code from sample XML: 
    // Generate Code to Create XML

    // <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
    // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    //     <SOAP-ENV:Header>
    //         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"></wsse:Security>
    //     </SOAP-ENV:Header>
    //     <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
    //         <z:FooBar xmlns:z="http://example.com" />
    //     </SOAP-ENV:Body>
    // </SOAP-ENV:Envelope>

    let xml = CkoXml()!
    xml.tag = "SOAP-ENV:Envelope"
    xml.addAttribute("xmlns:SOAP-ENV", value: "http://schemas.xmlsoap.org/soap/envelope/")
    xml.updateAttr(at: "SOAP-ENV:Header|wsse:Security", autoCreate: true, attrName: "xmlns:wsse", attrValue: "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd")
    xml.updateAttr(at: "SOAP-ENV:Header|wsse:Security", autoCreate: true, attrName: "SOAP-ENV:mustUnderstand", attrValue: "1")
    xml.updateAttr(at: "SOAP-ENV:Body", autoCreate: true, attrName: "xmlns:SOAP-SEC", attrValue: "http://schemas.xmlsoap.org/soap/security/2000-12")
    xml.updateAttr(at: "SOAP-ENV:Body", autoCreate: true, attrName: "SOAP-SEC:id", attrValue: "Body")
    xml.updateAttr(at: "SOAP-ENV:Body|z:FooBar", autoCreate: true, attrName: "xmlns:z", attrValue: "http://example.com")

    let gen = CkoXmlDSigGen()!

    // Indicate where the Signature will be inserted.
    gen.sigLocation = "SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security"

    // Add a reference to the fragment of the XML to be signed.

    // Note: "Body" refers to the XML element having an "id" equal to "Body", where "id" is case insensitive
    // and where any namespace might qualify the attribute.  In this case, the SOAP-ENV:Body fragment is signed
    // NOT because the tag = "Body", but because it has SOAP-SEC:id="Body"
    gen.addSameDocRef("Body", digestMethod: "sha1", canonMethod: "EXCL_C14N", prefixList: "", refType: "")

    // (You can read about the SignedInfoPrefixList in the online reference documentation.  It's optional..)
    gen.signedInfoPrefixList = "wsse SOAP-ENV"

    // Provide the private key for signing via the certificate, and indicate that
    // we want the base64 of the certificate embedded in the KeyInfo.
    gen.keyInfoType = "X509Data"
    gen.x509Type = "Certificate"

    var bUsePrivateKey: Bool = true
    success = gen.setX509Cert(cert, usePrivateKey: bUsePrivateKey)
    if success != true {
        print("\(gen.lastErrorText!)")
        success = pkcs11.closeSession()
        return
    }

    // Everything's specified.  Now create and insert the Signature
    let sbXml = CkoStringBuilder()!
    xml.emitCompact = true
    xml.getSb(sbXml)

    success = gen.createXmlDSigSb(sbXml)
    if success != true {
        print("\(gen.lastErrorText!)")
        success = pkcs11.closeSession()
        return
    }

    // Examine the XML with the digital signature inserted
    print("\(sbXml.getAsString()!)")

    // --------------------------------------------------------------------------

    // Revert to an unauthenticated session by calling Logout.
    success = pkcs11.logout()
    if success == false {
        print("\(pkcs11.lastErrorText!)")
        success = pkcs11.closeSession()
        return
    }

    // When finished, close the session.
    // It is important to close the session (memory leaks will occur if the session is not properly closed).
    success = pkcs11.closeSession()
    if success == false {
        print("\(pkcs11.lastErrorText!)")
        return
    }

    print("Success.")

}